The correct answer is Buffalo. Wallowing is a very important way for the buffaloes to maintain heir body temperature. When buffaloes enter the water, they defecate and/or urinate, this seems to be a way to mark their wallow. Wallowing has two purposes; the most obvious is that of cooling, the other is protection from insects. Wallowing during daytime is done during the hottest hours. Wallowing during nighttime is instead a way for the animal to protect itself from insects.